P0457 Mercury Code - EVAP Control System Leak Detected Fuel Filler Cap Loose/Off
Quick Answer
Vehicles that meet enhanced evaporative requirements utilize a vacuum-based evaporative system integrity check. Common causes include Missing fuel filler cap, Incorrect fuel filler cap used, Fuel filler cap remains open or fails to close. Severity is Low - monitor the vehicle and repair when practical. The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.
- What it means
- P0457 Mercury indicates EVAP Control System Leak Detected Fuel Filler Cap Loose/Off.
- Common causes
- Common causes include Missing fuel filler cap, Incorrect fuel filler cap used, Fuel filler cap remains open or fails to close.
- Severity
- Low - monitor the vehicle and repair when practical.
- Can I drive?
- The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.
Code P0457 Mercury Description
The Diagnostic Trouble Code (DTC) will set when the EVAP control system has a very large leak such as the fuel filler cap fell off, the EVAP control system does not operate properly.
What are the Possible Causes of the DTC P0457 Mercury?
- Missing fuel filler cap
- Incorrect fuel filler cap used
- Fuel filler cap remains open or fails to close
- Foreign matter caught in fuel filler cap
How to Fix the DTC P0457 Mercury?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
Code Tech Notes
1997-1999 Mercury Tracer
1997-2000 Mercury Mystique
1997-2003 Mercury Grand Marquis
1997-2003 Mercury Sable
1999-2002 Mercury Cougar
1997-2003 Mercury Mountaineer
Mercury Factory Service Bulletin OBDII Code P0457
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0457 Mercury code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
Need more information about the P0457 Mercury code?
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Need Help with the Code?
Get the P0457 Mercury code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about P0457 Mercury Code
1. What are common symptoms of OBDII code P0457 in a Mercury vehicle?
- Common symptoms include the check engine light coming on, a strong fuel odor around the vehicle, and potential difficulties during refueling.
2. What is the most common cause of OBDII code P0457 in a Mercury car?
- The most common cause is a loose or improperly secured fuel filler cap, which can lead to an EVAP system leak being detected by the vehicle's onboard diagnostics.
3. How can I confirm if the fuel filler cap is the cause of OBDII code P0457 in my Mercury vehicle?
- Inspect the fuel filler cap for any signs of damage or wear, ensure it is properly tightened after refueling, and reset the check engine light to see if the code returns.
4. Are there other potential causes of OBDII code P0457 besides a loose fuel filler cap in a Mercury?
- Yes, other causes can include a damaged or cracked fuel filler neck, a faulty EVAP system purge valve, loose or damaged EVAP system hoses, or a malfunctioning EVAP system pressure sensor.
5. How serious is OBDII code P0457 in a Mercury vehicle?
- While this code is not an immediate threat to your safety, it can lead to increased emissions and reduced fuel efficiency if left unresolved over time.
6. Can I continue driving my Mercury with OBDII code P0457?
- It is generally safe to drive the vehicle with this code, but it is recommended to address the issue promptly to prevent potential long-term damage to the EVAP system and ensure optimal vehicle performance.
7. How can I repair OBDII code P0457 in my Mercury if the fuel filler cap is not the issue?
- If the fuel filler cap is not the cause, it is advisable to have a professional mechanic perform a thorough inspection of the EVAP system components to identify and address the source of the leak.
8. Will resetting the check engine light resolve OBDII code P0457 in my Mercury?
- Resetting the check engine light may temporarily clear the code, but if the underlying issue, such as a loose fuel filler cap, is not addressed, the code is likely to return after some driving cycles.
9. Can a DIY enthusiast repair OBDII code P0457 in a Mercury, or is it best left to a professional?
- While checking and tightening the fuel filler cap can be done by most car owners, diagnosing and repairing other potential causes of the code may require specialized tools and expertise, making it advisable to consult a professional mechanic.
10. How can I prevent OBDII code P0457 from recurring in my Mercury after repairing it?
- To prevent the code from returning, ensure the fuel filler cap is properly secured after refueling, regularly inspect the EVAP system components for damage or leaks, and promptly address any issues that may arise with the system.
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